fix: broken compilation when using HAVE_LIBFONTS=0 (#194)

compilation currently fails with `make HAVE_LIBFONTS=0` due to
`EXIT_SUCCESS` not being defined. I assume Xft.h includes stdlib.h which
is why compilation works with HAVE_LIBFONTS=1

this switches to using 0 as cg_quit argument in keybindings. if my
interpretation of the C99 standard is correct, then 0 and EXIT_SUCCESS
means the same thing.

> If the value of status is zero or EXIT_SUCCESS, an
> implementation-defined form of the status successful termination is
> returned.

0 files changed, 0 insertions, 0 deletions